What pressurised oxygen actually does (and what it doesn't).
A grounded look at the mechanism behind HBOT: why pressure matters more than the oxygen itself, and where the honest limits sit.
What happens when you step into a pressurised chamber
At sea level, air presses on your body at one atmosphere absolute (1 ATA). Inside a hyperbaric chamber, that pressure rises to between 1.3 and 2.0 ATA, depending on the chamber type and the session protocol. The change is roughly equivalent to descending 3 to 10 metres underwater. Your ears may pop. You swallow, the sensation passes, and the session continues.
The pressure itself is not the therapy. Pressure is the delivery mechanism. It changes the way oxygen dissolves into your blood, and that shift in dissolved oxygen is where the meaningful physiology begins. Everything that follows in a hyperbaric session, from cellular energy production to tissue repair signalling, traces back to this single physical change: more oxygen, dissolved differently, reaching places it otherwise would not.
The pressurisation phase typically takes around 15 minutes. Once the chamber reaches its target pressure, you breathe oxygen through a mask or built-in breathing system for 60 to 90 minutes. Decompression at the end takes 7 to 10 minutes. The entire process is passive. You sit or lie down, breathe normally, and let the physics do the work.
Why pressure changes the equation
Under normal conditions, almost all the oxygen in your blood is carried by haemoglobin, the protein inside red blood cells. Haemoglobin is efficient, but it has a ceiling. At 1 ATA breathing regular air, haemoglobin is already about 97% saturated. You cannot meaningfully increase oxygen delivery by loading more onto haemoglobin because it is already close to full.
Plasma dissolution and Henry's Law
Henry's Law states that the amount of gas dissolved in a liquid is proportional to the pressure of that gas above the liquid. When you breathe pure oxygen at elevated pressure, oxygen dissolves directly into the blood plasma, the liquid portion of your blood, bypassing haemoglobin entirely. At 2.0 ATA breathing 100% oxygen, arterial oxygen tension can exceed 2,000 mmHg, compared to roughly 100 mmHg under normal conditions.
Reaching compromised tissue
This matters because plasma reaches places red blood cells sometimes cannot. In areas of swelling, compromised circulation, or tissue damage, capillaries may be too narrow or too few for red blood cells to pass through efficiently. Dissolved oxygen in plasma diffuses across tissue on a concentration gradient, from areas of high oxygen to areas of low oxygen, reaching the tissues that need it most.
What your cells do with the extra oxygen
Oxygen is the final electron acceptor in your mitochondria, the structures inside cells responsible for producing adenosine triphosphate (ATP), your body's primary energy currency. When oxygen supply to a tissue drops, ATP production drops with it. Cells shift into less efficient energy pathways, and their ability to maintain normal function, repair damage, and manage waste declines.
Flooding tissues with dissolved oxygen during a hyperbaric session reverses this bottleneck. Mitochondria operate more efficiently. ATP output increases. Cells that were energy-starved begin to function closer to their capacity again. This is not a permanent fix from a single session. It is a window of elevated cellular energy that, when repeated consistently, can support cumulative improvements in tissue function.
Growth factors and new blood vessels
Beyond ATP, elevated oxygen triggers a controlled burst of signalling molecules that activate pathways for growth factor production, collagen synthesis, and new blood vessel formation (angiogenesis). Over repeated sessions, new capillary networks form in areas that were previously under-supplied with blood. The body also mobilises stem and progenitor cells from bone marrow, which contribute to tissue repair at sites of damage.
Why consistency matters
A single session increases tissue oxygenation temporarily. Repeated sessions trigger the angiogenesis, collagen synthesis, and stem cell mobilisation pathways that produce lasting structural change. Consistency is what moves the needle from a temporary oxygen boost to meaningful adaptation. This is why our protocols run over six weeks rather than a handful of sessions.
What HBOT pairs well with
Hyperbaric oxygen works best as one component of a broader approach. At Element, clients commonly combine HBOT with other modalities depending on their goals.
For recovery, HBOT pairs well with whole-body cryotherapy (to manage inflammation) and red light therapy (which supports mitochondrial function through photobiomodulation). For general wellbeing and energy, clients often use HBOT alongside infrared sauna sessions for circulation and relaxation.
The key principle is cumulative effect. Our Injury Recovery, Longevity, Skin Recovery and Supportive Care protocols are all built around this idea: repeated sessions over six weeks, combining modalities in a sequence that gives the body the best conditions for its own repair processes.
Where the honest limits are
Hyperbaric oxygen therapy is well-researched for a defined set of applications. It is not a cure-all, and credible practitioners will tell you that upfront.
What the evidence supports
The strongest research covers wound healing (particularly in tissues with compromised blood supply), recovery from carbon monoxide exposure, and decompression illness. Outside these areas, research is active but less conclusive. There are promising findings in areas like post-concussion recovery, general fatigue, and age-related tissue decline, but the evidence base is still developing. Promising is not proven.
What HBOT does not do
HBOT does not replace medical treatment for acute illness. It does not cure chronic diseases. It is not a substitute for surgery, medication, or specialist care where those are indicated. Any provider claiming that hyperbaric oxygen "treats" or "cures" a specific condition is overstepping what the evidence supports.
Who should not use it
Contraindications include severe or acute asthma, emphysema or COPD, pneumothorax, severe heart disease, active respiratory infections, seizure disorders, certain eye conditions, sickle cell anaemia, and pregnancy. Certain medications are also contraindicated. We screen every client before their first session.
Side effects are mild but real
Ear barotrauma (similar to the pressure you feel during a flight descent), sinus discomfort, and temporary changes in vision (usually short-lived) are the most common. These are managed through proper session protocols and practitioner oversight.
How Element runs HBOT in Perth
Element Health Centres operates two chamber types at our Claremont and Duncraig locations. Your practitioner will recommend the right one based on your goals and comfort preference.
The Zeugma seated chamber has panoramic windows and delivers oxygen through a BIBS mask at approximately 93% efficiency. It operates at up to 2.0 ATA and suits clients who prefer a seated position or higher-pressure protocols.
The OxyHealth lie-down chamber is a single-person unit where you recline during the session. Oxygen delivery is via a free-flow mask or nasal cannula, with approximate efficiency of 60%. This chamber suits clients who prefer to lie down and relax.
Before your first session, you complete a pre-treatment assessment that screens for contraindications and establishes your baseline. Communication with your practitioner is maintained throughout. You are never locked in. If you want to talk through whether HBOT is right for you, book a complimentary 10-minute consultation.
Frequently asked questions
Is one session enough to feel a difference?
Most people notice mild relaxation and mental clarity after a single session. Meaningful, lasting benefits require a series of sessions. For general wellness, a minimum of 10 sessions is a reasonable starting point to assess your response.
How often should I come?
That depends on your goals. General wellness clients typically attend one to two times per week. Recovery-focused protocols may involve daily sessions, five days per week, over a defined period. Read our dedicated guide on HBOT frequency for a detailed breakdown.
Can I combine HBOT with other treatments at Element?
Yes, and most clients do. Common pairings include cryotherapy (for inflammation management), red light therapy (for complementary cellular energy support), and infrared sauna (for circulation and relaxation).
What does the session actually feel like?
During pressurisation, you may feel fullness in your ears, similar to descending in an aeroplane. Swallowing or gentle jaw movements relieve this. Once at pressure, most people relax, read, or rest. The chamber is well-lit with clear viewing windows.
What if I feel claustrophobic?
The Zeugma seated chamber has panoramic windows and a spacious interior. The lie-down chamber has a viewing window and maintains communication with your practitioner throughout. Discuss any concerns before booking so we can recommend the right chamber.
Talk it through with a Consultant.
A 10-minute consultation, complimentary and unhurried.